SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '74d63c38721aa4209810f47e41492f011a0d9e5763b663bc5d796c2b0177be69' 
  AND token = 'Joc8U1VXL52UHxj7mVMWl7CJNjgCW1JEQQPUGWR0wh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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