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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a691ee6dff9155405a92a448216fc02ad73a8ee7d5f4c98fa87f4162e8f98507' 
  AND token = '53yhCL5Kocp3o8NVMo0zNvq0gn1DEUbdE7VsgIM8p14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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