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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ddf6c7ffe79eff612e1eda137f2b854f69fff56ad27596f3d081d04451235fa' 
  AND token = '6c4RVqw8M5ZzNRxQuza/cMrJq84WqynIF60yg+k0ikU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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