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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff9e2b2bb9e1a1d7d3626fca35f45127c62b9c240c56acbd6fd73fc386a4e582' 
  AND token = 'tOZFsecvpdNXj7tgkFplnDVpDdudRmvn7lNIqwHSdQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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