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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33bac81513836e2cfef4df816ab1d06f25112370cee6effe4ab4e0dbd51ea7bb' 
  AND token = 'iYAd/J1mvd6gqXg8stvFcPtUkl1iJZttW9sS/Agt4Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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