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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ad475d3e71baf7f467cb3ef97d4acdcd9ae6b9e67710875931a3a03d6569511' 
  AND token = 'smfUWztQRSLWg6mn0LL41f21q7Jo6wYXgEyGvSDDFnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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