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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a95c93185110ca1e2f6e265fc6fd20f4b49f9b21d3f11099c9e0478bc20c4cb4' 
  AND token = '9KoO9dYr44FnocI0Lghm4J5ynF14Q2G2c7fVpLvwVL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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