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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11f66382db9c52c5f9353b542456057180c396de73f515e9244d8d8c704999b0' 
  AND token = 'eeXwN+u5mT59CaGx6shf1fDn7A1vBhbSO5onbx1arrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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