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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ac7ccea0109db830a98494343bf82672db7d0ebef846ddf89f0c7b47202bf0d' 
  AND token = 'rxnVGsGGK6/nouAZWuPOPPcO3cBV6A34wxgCCIDYAD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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