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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c15a86322c35bc97ea1cf8f3ef37def503d21202f869746d5196ef2f0a8c5a5' 
  AND token = '6VnEFWumRBodEmxOi4U/mZ94kHaX/mBIEoK2y9Ve7EQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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