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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f7bba0026b88c52c8c33351759da4f8efbe624dd05f958c1fc84c72cbbdb3e5' 
  AND token = 'DqolmlEDDFu1dhjJc6ch4LiTu1mweyRcLZ37ILW2c6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}