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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b99654d07af9dc52ff003c07481579707059d0e74568e9198090107d973d9152' 
  AND token = 'B1M72pp58Os5q3uA8H8SzrwoaTS5D6W0orckQjCX9pM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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