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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '418624dcd48b3aa7630dc4c74e63ee8bf38cbb37aa3879fc3df5ac5a60d4b89f' 
  AND token = 'u0p7UV7yu1XNrq1HM+Iz8XHGx+QAHm81kSA8vYCjWA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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