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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9edf4192910895aaba1f4081bcd61231af7928b394ca5744fe78359116edcf46' 
  AND token = '0MNbZbIzo4iFnV3X0nyKz8dJeRa5ZpXWeZ6ZMJSoG3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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