SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e60a9cdef5ff1f64fa857196a5d3dea1e7f81729e4002db1f8257eaab2dd3222' 
  AND token = 'mE+KymTShGS/uIvVTSBkVV6HpvukiI3pOGLshjcQgpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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