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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0545d5aece6bfc03ae9c2a3db51d9c29bbd294b382a0a124d521b69a4a4794c6' 
  AND token = 'XjLAQko2xDJ0WJGZUzCToE0JS1RkCctjxEWQ7lAhTGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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