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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b46f79493b2a28c766cb34f5c6f16ab1b3fef589413c70d7bafb67b7f0c10241' 
  AND token = '/o2QPE5S4PiQYwtfXzOv210cmhtnPWpkzGQ1W30b6dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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