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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2584293508189b464bbadff27a59cbae872f98005a07d627da31ec957b9fa59e' 
  AND token = 'yq01ugqcbeYE+nsfkf6U7Ny8kv0cRKAXPFs61tdQjB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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