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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2239b90f976fb88c74b674653f9ac09bfa4cfe6dc578ed943b5f41a94182ec37' 
  AND token = 'wONxsDxbpHh+0saQc64njBdEmlvLd7DXEaMdeYlcGdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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