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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15926f40040f4d20e0239325f077e493c0618abc0d59efff339ec2f9a4d30a61' 
  AND token = 'eZD/rBHNs41v11fOHGbrAByQuRu2YaQoaOYLl2o5SPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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