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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '991fddcba3cdf68ded0173a46e755928b648408d50e8dcf1412e0d000edca134' 
  AND token = 'IBF9BMrSWSmLwCiQ911pAdeprHVEtny2M/fkMvZXwq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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