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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a36e359fcdc1def162b02f9b7a1ab8f8645860d758fd76a11ec92e284b6d31d1' 
  AND token = 'lGTb1eEQnP9XPMWZvMMmkGdT45+aDHfaKDGWpHah9jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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