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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6b1252b1b9c0adf79fd0bc5bae0133b9a800a40618fdbd8db56eb08482bab010' 
  AND token = '4lVXPGqWeY9wpKQYG7V0F8zu2hvs9q4eap7zDMYmlPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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