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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1c90ce3dd1cceaab645b24c05ffa7a8e4cb300fe6ac6be26de5b0ba893cf2ff' 
  AND token = 'q7a7k0vn/VgOe1Xda5Rrst+2k+Txl0EJqMDB4O3KipY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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