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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00b7d1c4ccf66b54060346418b9cbf9b7b3fb2aeb6d2e5eb553a778af79deaa2' 
  AND token = '8hYKZ5oxXTOiIvvm/da80fGbiS3eVZ+K7vSNmjycUbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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