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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50333aaccbec421e53cfd6421b1577c3d23da2e3feb9be56ba6f08ed7ac6d17a' 
  AND token = 'uU1+So8ojz/9fqC7IE69dkrP9ZcnFudf5dtMvWEhZiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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