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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e98eaa77c6b8b8aec89faab87d117ada98793271b709439fd9fc71c915b99891' 
  AND token = 'N6Hgt4zV1Ks/3kKQGUNh8baKIhtdRZ6YkMRtE2dudeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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