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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fb28a1423af21f11acff2e220a3876363c44c68e721b1cf3d7fdfd5ecb45943' 
  AND token = 'iVg1U0zFcRYDnjFkyCCims66sQamIWWOTiFETWK5sPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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