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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b97119b5148d9b7695a11176a8a3e5f3cf5b518d026512ee56c5f444d72bf8fc' 
  AND token = 'OkrqNoOO7GpXfByJA9fcgets0gNFNtB3R8w6yWTslf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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