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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f29f066e761dc6779b9af3a659e0ef70ea907c70cdcf307e20889f8778dcc74' 
  AND token = 'HK8zC2b+gesKbJkFfilz3BgKVz7mSQHaitDNMjGMRrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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