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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8e23119f53493c07ba99ec893da1e48a7890cd7cbafe44d68528482d3cffbb0' 
  AND token = 'feZ7CsYjxfXpT9FEvLuNObzZEN6OftjpscovnUcHEKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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