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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '649871e908484e5ce368894a3631699d717f4cf54e362c4560ccf38d9e4e36e4' 
  AND token = '5l5ZAk90/qktVVOSkTNMq/5NwnF+68dZWI6kZBbpJnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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