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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48bc58c926fec1614c51d047882884e735a8256078f5ec78e3c6bbfcbe9b2ba0' 
  AND token = 'OIDPcxnCN9vSlErWvB3VgtALgldJpBTlxqdgqsB4d+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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