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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '287e0e5df17a7d874629c2164452dd65a58917841753b9a19d23058ea455af26' 
  AND token = '0juxYGOBLQnvebD6s5aMMaqqHq2ckCrXBT6kccU4nXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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