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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d229659afb46482a743b070187d650ca696e2d0825d403fcaf2fc6c5e24308d' 
  AND token = 'sq7PhYuaR/Xf00tQbqmkGtZySNyryfVpSW4wPfMofyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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