SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f144c8b3976de37b9a266d78c6e1172e156332e1b5589d866412191077762dd8' 
  AND token = 'nOGvUPsx397h/l/piPFk2m+g03LcT5jek7DWQycqHzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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