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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86cc36afb8830ec7ceb6ecd53e4f1fffbe0056436c6359449365bbbadb7483a0' 
  AND token = 'LNGp1oEfyjomfP62ypO6snQdODZIWT4NhIjSs2+3ZxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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