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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '106c0a21e02c25a0334c8ab7eda3c48baac2e15c93fe34a40ece034e44e10b9c' 
  AND token = 'gT5wWj7knT/RAWjM2rXNqFbTyw6t1LGB7EcEI9GHWhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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