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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'afa1cc2c21fb56479005de893c9f315c29d1bea22e4cee0df455014279e976dc' 
  AND token = 'lOxboccZcxyoZx6XhN0Q2XqBAc+CTiJKbuFh1QJyUeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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