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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03411ed5be362dbdc1dede538b6ed5f500b2286269e2a9a6470611a33f330bba' 
  AND token = 'M9vdpYjHTlEdrEK2qoB9typPhhxyOjdCudlsHq0B7zA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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