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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'df9c97511cb84fc091c712aa77b37eaaead9ce76aa440a5eabbdd78ab75aa158' 
  AND token = 'jWA2JPfAEEnIoTwNdSx6RpdaLgDiULIICR4HThPh7PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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