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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9de4b9db6e1e354f438fec24ff9a012ec4380123a3964ea8e3c4e4647329c09' 
  AND token = '/EHbBavDhBujznZQjTY8uVOZEP3SCDFli9REEnRVFEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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