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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '198c725fd325695a0d1d333da1e49a1179d6624d1c9305f0ba8946f21ee90296' 
  AND token = 'zr+v/X8uC6m6/K38TuhK2/xCn2LQ7RMb6cV6vAfcmD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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