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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f050f472245a5a87286d04889158b78fd14a4c92a0ecf05736519c7e38a7bd9b' 
  AND token = 'iQ/mKkuc45YcllixYOnHEIYkPfE52o+IH5BgHVRTsUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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