SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bad63b0f9b2a95cf945779d1de923b360551e7c58b128fb6f65ab4a01600c503' 
  AND token = '70cqeEkZEMJGhaV/GB0ZdNePgaAm4/3+NowJvgJeGA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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