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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e7d3145a1ce0f7ef795ca7e3669e2fceb3e60724ba47d21853db84f1667c3ce' 
  AND token = 'xIi8ybzayEFym0RHdtHYGZn2Txf7daW5Ffj5LIIgNrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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