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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0368d75143d233304215d465904060d94576811d2bc84f5de660a7b306e73fdc' 
  AND token = 'IijAOA6fuI8IRTHFCYEqxQuCbu8MMWBQDcoIqGVRxdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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