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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fdeb788d252fd6a1bd3877f10ed2bd72fe6e8fb0ecb04df7d21bd4a575e6702c' 
  AND token = '/NvSnM2MIrOHOCtV6Gc5zuGVGRzwDU67kk3MG7R8JDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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