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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '418f7d126b43d678dc8c16006c37c3792b64e421e94a38cd2c8acd720493d0ab' 
  AND token = '26dTsFrrxlOT0sY4FeOTGr1FRMJMk24/AGaos4ao6Q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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