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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2714fd538e64dab044292005c96d1980430332ef05532e8d27c757540568cb9c' 
  AND token = 'pZrMwP/YEZ2qEC2xXjrtfja0iySiSf2ZlCwIdVSviYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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