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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9917740be72b942afd58bf746fa83df4fc3858d088d489b155ff02591ef7c0e' 
  AND token = 'J4PPaiLsaR029tvaUnYrkeOKDtCQF870zuv0jowG6kU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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