SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '25be9a98a237862f60eba41a7dc32fa187e587c2611d0e0b729f4cd43ca0ec16' 
  AND token = 'Jt2cgxwKBWXQAgFZtAuspzy8+DuhynRgAcWNutvUw1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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