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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '755e4fae83ea7651f3321cbd98fdc2e0ac107536ac90a79d4246f59f55d16677' 
  AND token = '3rO+FFCkr8A1fb6Lz6orV/B98LriLk+PshOqnPcyqlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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