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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f2c39ebb5ad95ba3304dea4c0e6e372d8f1304ccc2ba7242691cea96bd8037b' 
  AND token = 'OFqJibm2nIAH/kp7DCzHx33LZi1Oas7PXE1IxJ6sS9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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