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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9af20e0943ffc5b69888e2221609f837b206d268ffe2dc65d71e053003ec43d' 
  AND token = 'kaXyZDE0fSwPkNshdweuwYVhwwoSVPrDrwI+OB5lojU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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