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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18ea5c9598b6d5161002f063e7d9b9481e884c73424d98c1018a07c8f9c70d04' 
  AND token = 'G9suxqOVVcV/8Zzq6uEk3o47iYxxxVXyNZN6rEaQzH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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