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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '062c9f48108531cf04b9034b23023bfb96f7d9922d7f8b954e998cfe77de371c' 
  AND token = '/k9ExdBFhR5zNmXAUqlt31BF4qXVSheBfaKSTNqNavk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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