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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f70daf3148f3ce9ba3e105c5fec7f8bcd6e072aa8bbfe86bda1bd784754b3654' 
  AND token = 'Lmg7xEr7HaA+e4NA8yQ5ctT3s7isJQ1hzJ8geFef6D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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