SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '952fd444dd9fa37107f2bba86d4e783c877965f446c145c6c313364a9094f164' 
  AND token = 'jAzYDpI+0msY+XkKwfaXT3GwyrfoLg7GIhMhfy9ddr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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