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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b80ac71e5bbd9bbdd921361889ceef2198bfbc3faff990d2ecc42a2fdf906728' 
  AND token = '4sALXS86wFPo8nq3ZwYbxynGYadOSncLG5pkBAumI4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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