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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b781280b49cf2802474334ac981ab2d5366a6aed0a9a45b1d4456df2f65619db' 
  AND token = 'EhXzirsBeldfxcqkxqCzuv8AfOzmlc1g6BdZHDYA0y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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