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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff687bfc9bfce0d98535c0d5dd2616a610c2d5b4063329549028d4eeeaff02a3' 
  AND token = 'HAnn7KQ5JtyCN26KKJbkV2wBRGyKFl3ePeR+EydLr4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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