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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ade18d8b6ba672b16e1740e18cb09a2d32fe8d3836ddafa2a9927cc8a1c9f6f' 
  AND token = 'Xj9BPjwIePbfSaV8Z0Q165uRPZlKTus2O4VBEQHyTac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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