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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d539143565d0ed7d7b660eee7a5e2f30b769a0ab07ffab6efb13089fcc243cf' 
  AND token = '7h409qHhozalr6QVQ4jqUKc9NlXO0HX5I+a3BA72lSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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