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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4ee3c57c6fb53381fd3e8529d91658cc7929d57585287cf9c82c7dcc1cb3f0e' 
  AND token = 'NQZVG3qcRw4a5yEVOvHK7RyLb91wecTqHbFKDZhx3fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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